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<SEC-DOCUMENT>0001104659-10-003317.txt : 20100127
<SEC-HEADER>0001104659-10-003317.hdr.sgml : 20100127
<ACCEPTANCE-DATETIME>20100127164452
ACCESSION NUMBER:		0001104659-10-003317
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20100127
DATE AS OF CHANGE:		20100127

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BYRNE JOHN J
		CENTRAL INDEX KEY:			0000901312

	FILING VALUES:
		FORM TYPE:		SC 13G/A

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WHITE MOUNTAINS INSURANCE GROUP LTD
		CENTRAL INDEX KEY:			0000776867
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				942708455
		STATE OF INCORPORATION:			D0
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-36786
		FILM NUMBER:		10551074

	BUSINESS ADDRESS:	
		STREET 1:		80 SOUTH MAIN ST
		CITY:			HANOVER
		STATE:			NH
		ZIP:			03755
		BUSINESS PHONE:		603 640 2200

	MAIL ADDRESS:	
		STREET 1:		80 SOUTH MAIN STREET
		CITY:			HANOVER
		STATE:			NH
		ZIP:			03755

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WHITE MOUNTAINS INSURANCE GROUP INC
		DATE OF NAME CHANGE:	19990603

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FUND AMERICAN ENTERPRISES HOLDINGS INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FUND AMERICAN COMPANIES INC
		DATE OF NAME CHANGE:	19920701
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>a10-2499_1sc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>

<html>

<head>





</head>

<body bgcolor="white" lang="EN-US">

<div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.06%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="53%" valign="top" style="padding:0in .7pt .7pt .7pt;width:53.16%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SECURITIES
  AND EXCHANGE COMMISSION</font></b></p>
  </td>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.78%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.06%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="53%" valign="top" style="padding:0in .7pt .7pt .7pt;width:53.16%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
  D.C. 20549</font></b></p>
  </td>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.78%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.06%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="53%" valign="top" style="padding:0in .7pt .7pt .7pt;width:53.16%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="23%" valign="top" style="padding:0in .7pt .7pt .7pt;width:23.78%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SCHEDULE
13G</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(Rule
13d-102)</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INFORMATION
TO BE INCLUDED IN STATEMENTS FILED PURSUANT</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TO RULES
13d-1(b) (c), AND (d) AND AMENDMENTS THERETO FILED</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PURSUANT
TO RULE 13d-2<br>
(Amendment No.&nbsp;13)*</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;">

<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">WHITE
MOUNTAINS INSURANCE GROUP, LTD.</font></b></p>

</div>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Name of Issuer)</font></p>

<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in;">

<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Common
Shares</font></b></p>

</div>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Title of Class of
Securities)</font></p>

<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in;">

<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">G9618E
10 7</font></b></p>

</div>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(CUSIP Number)</font></p>

<div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in;">

<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">December
31, 2009</font></b></p>

</div>

<p align="center" style="margin:0in 0in 12.0pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Date of Event
Which Requires Filing of this Statement)</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box to designate the rule pursuant to which this
Schedule is filed: </font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%;">
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.46%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
  <td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(b)</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.46%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
  <td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(c)</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.46%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>
  </td>
  <td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rule 13d-1(d)</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*The remainder of this cover page shall be filled out for a reporting
person&#146;s initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page. </font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information required in the remainder of this cover page shall not
be deemed to the &#147;filed&#148; for the purpose of Section 18 of the Securities
Exchange Act of 1934 (&#147;Act&#148;) or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\nsampath\10-2499-1\task3891705\2499-1-ba.htm',USER='105226',CD='Jan 28 01:43 2010' -->


<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="100%" colspan="6" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CUSIP No.&nbsp;G9618E 10 7</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1</font></p>
  </td>
  <td width="91%" colspan="4" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name of Reporting Persons</font><font size="2" style="font-size:10.0pt;"><br>
  S.S. (OPTIONAL) OR I.R.S. Identification No. of Above Persons<br>
  John J. Byrne</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  </td>
  <td width="91%" colspan="4" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the Appropriate Box
  if a Member of a Group</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>
  </td>
  <td width="86%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>
  </td>
  <td width="86%" colspan="2" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  </td>
  <td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SEC Use Only </font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>
  </td>
  <td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Citizenship or Place of
  Organization </font><font size="2" style="font-size:10.0pt;"><br>
  United States</font></p>
  </td>
 </tr>
 <tr>
  <td width="13%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.84%;">
  <p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
  <p align="right" style="margin-left:0in;margin-right:0in;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="81%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="13%" colspan="3" rowspan="7" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:13.84%;">
  <p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Number of<br>
  Shares<br>
  Beneficially<br>
  Owned by<br>
  Each<br>
  Reporting<br>
  Person With</font></p>
  </td>
  <td width="4%" colspan="2" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
  <p style="margin-left:0in;margin-right:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>
  </td>
  <td width="81%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole Voting Power </font><font size="2" style="font-size:10.0pt;"><br>
  700,733**</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="4%" colspan="2" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6</font></p>
  </td>
  <td width="81%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared Voting Power</font><font size="2" style="font-size:10.0pt;">  <br>
  31,273**</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="4%" colspan="2" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">7</font></p>
  </td>
  <td width="81%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Sole Dispositive Power</font><font size="2" style="font-size:10.0pt;">  <br>
  700,733**</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="86%" colspan="3" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr style="page-break-inside:avoid;">
  <td width="4%" colspan="2" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.94%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8</font></p>
  </td>
  <td width="81%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:81.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Shared Dispositive Power <br>
  31,273**</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9</font></p>
  </td>
  <td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Aggregate Amount
  Beneficially Owned by Each Reporting Person</font><font size="2" style="font-size:10.0pt;"><br>
  732,006**</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10</font></p>
  </td>
  <td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check if the Aggregate
  Amount in Row (9) Excludes Certain Shares&nbsp;
  </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">11</font></p>
  </td>
  <td width="91%" colspan="4" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Percent of Class
  Represented by Amount in Row (9)</font><font size="2" style="font-size:10.0pt;"><br>
  8.3%**</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="6" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="3%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:5.44%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">12</font></p>
  </td>
  <td width="91%" colspan="4" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:91.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Type of Reporting Person</font><font size="2" style="font-size:10.0pt;"><br>
  IN</font></p>
  </td>
 </tr>
 <tr height="0">
  <td width="24" style="border:none;"></td>
  <td width="41" style="border:none;"></td>
  <td width="38" style="border:none;"></td>
  <td width="1" style="border:none;"></td>
  <td width="36" style="border:none;"></td>
  <td width="608" style="border:none;"></td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">**&#160; For
additional information, see Schedule A hereto.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_152300_7056"></a></font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.02%;">
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1(a).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name of Issuer:<br>
  White Mountains Insurance Group, Ltd.</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1(b).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address of Issuer&#146;s
  Principal Executive Offices:<br>
  80 South Main Street</font></p>
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Hanover, New Hampshire
  03755</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2(a).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name of Person Filing:<br>
  John J. Byrne</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2(b).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Address of Principal
  Business Office:<br>
  80 South Main Street</font></p>
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Hanover, New Hampshire
  03755</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2(c).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Citizenship:<br>
  United States</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2(d).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title of Class of
  Securities:<br>
  Common Shares</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2(e).</font></b></p>
  </td>
  <td width="3%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:87.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CUSIP Number:<br>
  G9618E 10 7</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 3.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.8%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">If this statement is filed pursuant
  to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a:</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.2%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.8%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_152305_5335"></a></font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<div style="font-family:Times New Roman;">

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 4.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
  <p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font></p>
  </td>
  <td width="86%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amount beneficially
  owned:&nbsp;&nbsp;&nbsp; </font></p>
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See Schedule A hereto.</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
  <p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font></p>
  </td>
  <td width="86%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Percent of class:&nbsp;&nbsp;&nbsp; </font></p>
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See Schedule A hereto.</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:4.12%;">
  <p align="center" style="margin:3.0pt 0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>
  </td>
  <td width="86%" style="border:none;border-bottom:solid windowtext 1.0pt;padding:3.0pt 3.0pt 3.0pt 3.0pt;width:86.16%;">
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Number of shares as to
  which person filing this Schedule 13G has (i) sole power to vote or to direct
  the vote; (ii) shared power to vote or to direct the vote; (iii) sole power
  to dispose or to direct the disposition of; or (iv) shared power to dispose
  or to direct the disposition of.</font></p>
  <p style="margin:3.0pt 0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">See Schedule A hereto.</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 5.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership of Five Percent or Less
  of a Class.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">If this statement is being filed to report the fact
  that as of the date hereof the reporting person has ceased to be the
  beneficial owner of more than 5 percent of the class of securities, check the
  following &nbsp;</font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">.</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 6.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ownership of More than Five Percent
  on Behalf of Another Person.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 7.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Identification and Classification
  of the Subsidiary Which Acquired the Security Being Reported on by the Parent
  Holding Company.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" valign="top" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 8.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Identification and Classification
  of Members of the Group.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
 <tr>
  <td width="100%" colspan="3" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:100.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Notice of Dissolution of Group.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" colspan="2" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4<a name="PB_4_152311_5796"></a></font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 10.</font></b></p>
  </td>
  <td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Certification.</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="9%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:9.72%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="90%" style="padding:3.0pt 3.0pt 3.0pt 3.0pt;width:90.28%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURE</font></u></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">After reasonable inquiry and to the best of my
knowledge and belief, I certify that the information set forth in this
statement is true, complete and correct. </font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date:</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.82%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">January 27, 2010</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="bottom" style="padding:0in 0in 0in 0in;width:44.42%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.82%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="bottom" style="padding:0in 0in 0in 0in;width:44.42%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.82%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.08%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="44%" valign="bottom" style="padding:0in 0in 0in 0in;width:44.42%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in 0in 0in 0in;width:42.82%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="44%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ John J. Byrne</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5<a name="PB_5_151805_7056"></a></font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Schedule A</font></u></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">BENEFICIAL
OWNERSHIP AND VOTING OF COMMON SHARES</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The 8.3% of the common
shares of White Mountains Insurance Group, Ltd. (the &#147;Company&#148;) shown in the
foregoing Schedule 13G as beneficially owned by Mr. John J. Byrne and/or Mrs.
Dorothy M. Byrne was calculated using 8,860,150 common shares of the Company
outstanding on December 31, 2009 as shown in the official records of the
Company.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The 732,006 common shares
of the Company shown in the foregoing Schedule 13G as beneficially owned by Mr.
Byrne represent (a) 700,733 shares held directly by Mr. Byrne as to which Mr.
Byrne has dispositive and voting power; (b) 1,221 shares held directly by Mrs.
Byrne as to which Mrs. Byrne has dispositive and voting power; (c) 16,081
shares held by a foundation as to which Mr. Byrne and/or Mrs. Byrne have
dispositive and voting power; and (d) 13,971&#160;
shares held by Memorial Sloan-Kettering Cancer Center (&#147;MSK&#148;) pursuant
to a letter agreement between MSK and Mr. and Mrs. Byrne dated December 30,
1992, as to which Mrs. Byrne shares dispositive and voting power.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On January 22, 2007, Mr.
and Mrs. Byrne irrevocably granted full proxy to vote certain of the shares
shown above as beneficially owned by them (totaling 701,954 shares as of
December 31, 2009) to Mr. Raymond Barrette, Chairman and Chief Executive
Officer of the Company, until the earlier of (i) January 1, 2012 or (ii) the death
of John J. Byrne.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Mr. Byrne disclaims beneficial ownership
of the shares listed in (c) and (d) above.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6<a name="PB_6_151954_5335"></a></font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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